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TO ALL PERSONS TO WHOM THESE PRESENTS MAY COME:

Be it known that I, MARCELLUS V. OUMMINQS, of Winthrop, in the county of Kenncbec, and Sta-te of 'Maine, have invented a new and useful Improvement in Oscillating Steam Engines; and do hereby declare the same to be fully described in the following specification, and represented in the'a-ccompanying drawings, of

which.

Figure 1 is a top view, and

Figure'2 a side elevation ofv an engine provided with my invention. j

Figure 3 is a vertical section of its trunnion and the bearing and pipes and cocks thereoi.

Figure 4 is a horizontal section taken through the trunnion and cylinder.

In such drawings, A denotes the cylinder, having at its middle two trunnions, a b, projecting in opposite directions, and resting in boxes or bea-rings B C. The piston D of the cylinder is applied directly to the wrist of a crank, E, of' a. horizontal shaft, F, on which there may be a fly-wheel or pulley, G. A pipe or conduit, d, leads upward from the bearing of the trunnion a to a. hollow joint connection, @from which extend, in opposite directions, two pipes, f g, which open at their outer ends into the cases of two stop-cocks h z'. An induction pipe, lc, leads into the cock h, and an eduction pipe or passage, l, leads out ofthe cock z'. The plugs m n, of the two stop-cocks have bent passages extending through them, as represented in the drawings. Furthermore there are two passages, op, made vertically through the trunnion a, and on opposite sides of its axis, and in the plane of the pipe d. From these passages ports or other passages, g r, lead to the opposite ends of the interior space of the cylinder, the whole being as represented as the drawings. Furthermore, another pipe, s, leads out of the trunnibn-bearing in the box B and into a pipe connection, t, from which two other pipes, u v, branch to and open into the cases of the cocks t z'. By revolving the plug m of the cock L, steam from the pipe k may bemade to pass either into the pipe f or into the pipe u, it being shut od' from one while passing into the other of such pipes fu. So by turning the plug n ofthe cock z', communication between either of the pipes g c and the pipe. Zmay be caused to take place, one of the pipes g v being out of communication with the pipe l when the other is'in communication with it. The passages o r of the trunnion a are to be so arranged that when they are vertical communication between the pipes @Z s and the trunnion-hearing will be arrested; also, so that the cylinder when vihrated in either direction, shall bring one of the passages o p into conjunction with the pipe d, and the other into conjunction with the pipe s.

From the above it will be seen that when the plugs of the cocks are turned so as to bring the pipe k into communication with the pipef, and the pipe c into communication with the pipe Z, and steam is allowed into the pipe 7c, such steam will pass through the pipes f and d. Now., if the forward end of the cylinder be depressed a little, so as to open communication between the pipe d and the passage p, and also between the passage o and the pipe s, the steam will rush into the rear part of the cylinder, and will drive the piston ahead. The exhaust will pass through the passages r o and thepipes e, v, and l. As soon as the crank may have passed the deadpoint, or directly after such passage, the trunnion a will be moved by the cylinder so as to bring the passage o into communication with the pipe d, and also the passage p into communication with the pipe s, in which case the piston will be driven back in the cylinder. By turning the plugs m n so as to cause the pipe lc to open into the pipe u, and the pipe g to open into the pipe Z, the movement of the piston may be reversed. When it may not be desirable to have the engine capable of being reversedpthe pipes fg and u v, and the stopcocks L z', may bc dispensed with, the said pipes being essential when the engine is applied to or makes part of a locomotive.

I claim'the combination as well as the arrangement of the trunnion-passages op with the cylinder-ports gr, and the box B, and its induction and eduction passages or pipes d' s. A

I also claim the combination as well as the arrangement ofthe two cocks h 'L' and the conduits f g u uwith the conduits d s, the box B, the trunnion a, its passages op, and the ports q r of the cylinder, the whole being to operate substantially as specied.

' MARCELLUS V. CUMMINGS.

Witn esses:

R. H. EDDY, F. I. HALE, Jr. 

